Osprey Ultralight 30 sleeping bag, made in the USA by Feathered friends of Seattle, WA. This bag is ultra-light and designed for a lifetime's worth of use. Feathered Friends' possesses a legendary reputation for making quality products. It's made from 900+ goose down, not feathers that predominate the fill of cheaper sleeping bags, offering less thermal insulation. For those of you that are in the know, 900+ fill is highly desirable and very expensive. It provides superior loft and thermal retention properties as a result.Goose down consists of fluffy filaments that are a lot like human hair. A single ounce of average quality down contains about 2 million of these filaments which interlock to keep warm air in and cold air out. This layer is very springy so you can scrunch it up by compressing it, but it will spring back into shape almost immediately.Fill power measures the lofting power of goose down which is its ability to trap air. To measure fill power, one ounce of down is compressed in a small glass cylinder. When the weight is removed, the down’s ability to spring back can be measured.  Down with a higher fill power rating is more resilient to compression, lofts better, and can trap more air. Besides being warmer, this also means that sleeping bags or parkas with a higher fill ratings require less insulation by weight to provide the same level of warmth than an item made with lower quality down.For example, sleeping bags or quilts with a fill rating of 800-900 will provide an outstanding level of warmth and are preferred by backpackers, mountaineers, rock climbers, etc. that want a warm but very lightweight piece of gear. Sleeping bags with fill ratings of 600-700 are considered very good, 500-550 is considered good, and 400-450 is considered medium quality.
If you've shopped at Feathered Friends in Seattle, then you know that their products rarely go on sale. If they have an overproduction of a product, they will offer a sale, but this is usually limited to the jackets that they manufacture, rarely will one see a sale on sleeping bags, and then only for a very small number of them, never for an entire line.This bag has never been used and it comes with all of its original stuff sacks and owner's manual. It is very light, weighing in at a mere 25 ounces. I own several other Feathered Friends bags and jackets, and now that I've relocated to Arizona, I don't need this bag.Feathered Friends has a well-earned reputation for conservative temperature ratings, and Osprey UL 30 can let you sleep comfortably all the way down to 18°F. Specifications: Temperature Rating 30ºF / -1.1ºCDimensions 60″ / 56″ / 38″Length Reg: 6′ 0″ / 183 cmSleeping Bag Shell Fabric Pertex® Endurance ULLining Fabric Flite 15 denier ripstop nylonFill Power 900+ Goose DownFill Weight Reg 13.6 oz / 385 gAverage Weight Reg 1 lb 9 oz / 710 gPacked Size 7″ x 12″Zip Side Left·Free Shipping on this item. I package all items very securely and ship within 2 days, excepting Sunday and holidays.